ASP.NET Web API in C#

To call a RESTful service API in C#, you can use the HttpClient class. Here is an example:

using System.Net.Http; using System.Threading.Tasks; public static async Task<string> CallRestApi(string url) { using (HttpClient client = new HttpClient()) { HttpResponseMessage response = await client.GetAsync(url); response.EnsureSuccessStatusCode(); string responseBody = await response.Content.ReadAsStringAsync(); return responseBody; } } 

To pass an array of values in ASP.NET Web API, you can use the [FromUri] attribute to bind the values from the query string to an array parameter in your action method. Here is an example:

[HttpGet] public IHttpActionResult MyActionMethod([FromUri] int[] values) { // do something with the values array } 

To ignore a specific object property during JSON serialization in Web API, you can use the [JsonIgnore] attribute on the property. Here is an example:

public class MyModel { public int Id { get; set; } [JsonIgnore] public string Secret { get; set; } public string Name { get; set; } } 

In this example, the "Secret" property will be ignored during JSON serialization.

Examples

1. C# Web API authentication in ASP.NET:

   • Implementing authentication in ASP.NET Web API using C#.
   • Code snippet:

     [Authorize] public class ValuesController : ApiController { // Controller actions } 

2. ASP.NET Web API routing in C#:

   • Configuring and understanding routing in ASP.NET Web API using C#.
   • Code snippet:

     config.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{id}", defaults: new { id = RouteParameter.Optional } ); 

3. Securing ASP.NET Web API endpoints in C#:

   • Ensuring security for specific endpoints in ASP.NET Web API using C#.
   • Code snippet:

     [Authorize(Roles = "Admin")] public IHttpActionResult SecureEndpoint() { // Endpoint logic } 

4. ASP.NET Web API versioning in C#:

   • Managing API versioning in ASP.NET Web API using C#.
   • Code snippet:

     config.Services.Replace(typeof(IHttpControllerSelector), new VersionedControllerSelector(config)); 

5. C# Web API parameter binding:

   • Handling parameter binding in ASP.NET Web API using C#.
   • Code snippet:

     public IHttpActionResult Get(int id) { // Retrieve data based on the id parameter } 

6. Working with JSON in ASP.NET Web API:

   • Processing JSON data in ASP.NET Web API using C#.
   • Code snippet:

     public IHttpActionResult Post([FromBody] MyModel data) { // Process JSON data } 

7. C# Web API error handling:

   • Implementing error handling in ASP.NET Web API using C#.
   • Code snippet:

     public IHttpActionResult Get() { try { // Logic that may throw an exception } catch (Exception ex) { return InternalServerError(ex); } } 

8. ASP.NET Web API CORS in C#:

   • Enabling Cross-Origin Resource Sharing (CORS) in ASP.NET Web API using C#.
   • Code snippet:

     config.EnableCors(new EnableCorsAttribute("*", "*", "*")); 

9. Token-based authentication in ASP.NET Web API:

   • Implementing token-based authentication in ASP.NET Web API using C#.
   • Code snippet:

     [Authorize] public IHttpActionResult SecureEndpoint() { // Access secured endpoint } 

10. C# Web API model validation:

    • Validating input models in ASP.NET Web API using C#.
    • Code snippet:

      public IHttpActionResult Post([FromBody] MyModel data) { if (!ModelState.IsValid) { return BadRequest(ModelState); } // Process valid data } 

11. Implementing CRUD operations in ASP.NET Web API:

    • Performing CRUD operations in ASP.NET Web API using C#.
    • Code snippet:

      public IHttpActionResult Get(int id) { // Retrieve data based on the id parameter } public IHttpActionResult Post([FromBody] MyModel data) { // Create new data } public IHttpActionResult Put(int id, [FromBody] MyModel data) { // Update data based on the id parameter } public IHttpActionResult Delete(int id) { // Delete data based on the id parameter } 

12. Dependency injection in ASP.NET Web API:

    • Implementing dependency injection in ASP.NET Web API using C#.
    • Code snippet:

      public class ValuesController : ApiController { private readonly IService _service; public ValuesController(IService service) { _service = service; } } 

13. C# Web API custom filters:

    • Creating and using custom filters in ASP.NET Web API using C#.
    • Code snippet:

      public class CustomFilterAttribute : ActionFilterAttribute { // Custom filter logic } 

14. Securing ASP.NET Web API with OAuth in C#:

    • Securing ASP.NET Web API using OAuth authentication in C#.
    • Code snippet:

      [Authorize] public IHttpActionResult SecureEndpoint() { // Access secured endpoint } 

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